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Note 8 - Leases - Leases Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Amortization of finance lease assets $ 254 $ 156 $ 440 $ 285
Interest on finance lease liabilities 105 48 173 74
Total finance lease costs 359 204 613 359
Operating lease cost 760 811 1,519 1,576
Short-term lease cost 178 155 374 287
Variable lease cost [1] 197 193 427 388
Sublease income (46) (45) (92) (90)
Total operating lease costs 1,089 1,114 2,228 2,161
Total lease cost $ 1,448 $ 1,318 2,841 2,520
Operating cash outflow from operating leases     $ 1,800 $ 1,764
Weighted-average remaining lease term-finance leases at end of period (in years) (Year) 2 years 2 months 12 days 1 year 9 months 18 days 2 years 2 months 12 days 1 year 9 months 18 days
Weighted-average remaining lease term-operating leases at end of period (in years) (Year) 9 years 3 months 18 days 10 years 4 months 24 days 9 years 3 months 18 days 10 years 4 months 24 days
Weighted-average discount rate-finance leases at end of period 8.60% 9.00% 8.60% 9.00%
Weighted-average discount rate-operating leases at end of period 8.50% 8.80% 8.50% 8.80%
[1] Variable lease costs consist primarily of taxes, insurance, utilities, and common area or other maintenance costs for the Company’s leased facilities and equipment.